CN218251223U - Coating die head and coating equipment - Google Patents

Abstract

The application discloses coating die head and coating equipment. The coating die head comprises: the die head body is provided with a feeding hole and a discharging hole which are communicated with the material cavity, and the feeding hole is positioned in the middle of the material cavity in the first direction; the pressing strip is arranged in the material cavity and extends along the first direction, a gap is formed between the pressing strip and the wall surface of the material cavity, and the size of the middle of the gap is smaller than the size of the two ends of the gap in the first direction. The size through the middle part of injecing the clearance is less than the size at the both ends in clearance, when thick liquids in the both ends in clearance flow to the clearance middle part, can compensate the thickness of thick liquids at the middle part in material chamber, the thick liquids thickness that makes the length direction's that is located material chamber middle part and the thick liquids thickness that is located the length direction's in material chamber both ends are roughly equal to make thick liquids material loading supply stable, guarantee that thick liquids form even stable flow state in the coating die head, and then guarantee the uniformity of coating weight.

Description

Coating die head and coating equipment

Technical Field

The application relates to the technical field of coating equipment, in particular to a coating die head and coating equipment.

Background

In the production process of the battery monomer, the positive pole piece and the negative pole piece are both prepared by using a coating process. The coating die head used in the coating process is provided with a feeding hole, a discharging hole and a material cavity communicated with the feeding hole and the discharging hole, external slurry enters the material cavity through the feeding hole under certain pressure, and the slurry is extruded and sprayed out along the discharging hole (a discharging gap of the coating die head) under certain pressure and flow under the action of a pressing strip and transferred onto a base material, so that the slurry is coated on the base material.

However, the slurry in the material chamber flows to the middle part of the length direction of the material chamber under the action of gravity, so that the slurry is agglomerated and settled in the middle part of the material chamber, and the consistency of the coating weight is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a coating die and a coating apparatus that can ensure the uniformity of coating weight.

The application also provides a coating device with the coating die head.

In a first aspect, the present application provides a coating die comprising: the die head comprises a die head body, a first guide plate and a second guide plate, wherein the die head body defines a material cavity extending along a first direction, the die head body is provided with a feeding hole and a discharging hole which are communicated with the material cavity, and the feeding hole is positioned in the middle of the material cavity in the first direction; the pressing strip is arranged in the material cavity and extends along the first direction, a gap is formed between the pressing strip and the wall surface of the material cavity, and the size of the middle of the gap is smaller than the size of two ends of the gap in the first direction.

Among the technical scheme of this application embodiment, size through the middle part of injecing the clearance is less than the size at the both ends in clearance, when thick liquids in the both ends in clearance flow to the clearance middle part, can compensate the thickness of thick liquids at the middle part in material chamber, make the thick liquids thickness that is located the length direction's in material chamber middle part roughly equal with the thick liquids thickness that is located the length direction's in material chamber both ends, even the thick liquids thickness in the material chamber roughly equals on the first direction, thereby make thick liquids material loading supply stable, guarantee that thick liquids form even stable flow state in the coating die head, and then guarantee coating weight's uniformity.

In some embodiments, the gap gradually decreases in size from both ends of the bead to a middle of the bead in the first direction. So set up, make the size trend of change in the first direction in clearance more gentle, further guarantee that thick liquids form even stable flow state in coating die head to guarantee coating weight's uniformity.

In some embodiments, the gap includes a first gap, a bottom gap and a second gap which are sequentially arranged and communicated in the first direction, the pressing strip has a bottom wall, and a first side wall and a second side wall which are oppositely arranged in the first direction, wherein the bottom gap is defined between the bottom wall and the wall surface of the material cavity, the first gap is defined between the first side wall and the wall surface of the material cavity, the second gap is defined between the second side wall and the wall surface of the material cavity, and the sizes of the first gap and the second gap are larger than the size of the bottom gap. The thickness of the slurry in the slurry cavity is approximately equal in the first direction, so that the slurry is stably supplied, the uniform and stable flowing state of the slurry in the coating die head is ensured, and the consistency of the coating weight is ensured.

In some embodiments, the first gap and/or the second gap extend downward in the first direction toward a direction proximate to the bottom gap. The slurry in the first gap and/or the second gap can smoothly flow towards the bottom gap under the action of gravity, and a uniform and stable flowing state of the slurry in the coating die head is ensured, so that the consistency of the coating weight is ensured.

In some embodiments, the size of the first gap and/or the second gap gradually decreases in a direction near the bottom gap, further ensuring that the thickness of the slurry in the slurry chamber is substantially equal in the first direction.

In some embodiments, the first gap and/or the second gap have a maximum dimension of 1.5mm-2.5mm. By limiting the maximum size of the first gap and/or the second gap, the thickness of the slurry coated on the substrate can be controlled to meet the coating requirements.

In some embodiments, the size of the bottom gap remains constant along the first direction; alternatively, the size of the bottom gap tends to decrease and then increase from the first gap to the second gap along the first direction, so that the coating weight is consistent in the first direction, and a slurry having a certain width and a uniform thickness in the first direction can be formed on the base material.

In some embodiments, the bottom gap has a minimum dimension of 1mm to 2mm. By limiting the minimum size of the bottom gap, the thickness of the slurry applied to the substrate can be controlled to meet the application requirements.

In some embodiments, the first and second sidewalls extend gradually downward in a direction approaching each other. The structure of layering is improved like this for the size in first clearance and/or second clearance reduces along the direction of being close to the bottom clearance gradually, makes the thick liquids thickness of material intracavity roughly equal on the first direction, thereby makes thick liquids material loading supply stable, guarantees that thick liquids form even stable flow state in the coating die head, and then guarantees the uniformity of coating weight.

In some embodiments, the surface of the first sidewall and the surface of the second sidewall form a curved surface, further ensuring that the slurry forms a uniform and stable flow state in the coating die, thereby ensuring coating weight consistency.

In some embodiments, the bead has a third sidewall and a fourth sidewall disposed back to back in a second direction perpendicular to the first direction, the bottom wall of the bead being located between the third sidewall and the fourth sidewall; the gap comprises a third gap and a fourth gap, the third gap is defined between the third side wall and the wall surface of the material cavity, the fourth gap is defined between the fourth side wall and the wall surface of the material cavity, the bottom gap is communicated with the third gap and the fourth gap, and the third gap is closer to the discharge hole relative to the fourth gap so as to be communicated with the bottom gap and the discharge hole.

In some embodiments, the size of the third gap gradually decreases from bottom to top, and the size of the fourth gap gradually decreases from top to bottom. So set up, can guarantee the pressure in the material intracavity, guarantee that the thick liquids forms even stable flow state in the coating die head, and then guarantee the uniformity of coating weight, can form the thick liquids that have certain width and wait thickness on the substrate.

In some embodiments, the bead includes a first extension and a second extension arranged in the first direction, and the first extension and the second extension are separately formed. The press strip is divided into at least two extension sections to be formed respectively, so that the press strip is simple in structure and convenient to form, and the press strip are formed independently as an integral slender structure, so that the structural strength of the press strip can be guaranteed, and the slurry is guaranteed to form a uniform and stable flowing state in the coating die head.

In some embodiments, the first and second extensions are disposed axisymmetrically about an axis of symmetry that is perpendicular to the first direction to ensure uniform and stable flow of the slurry within the coating die and, thus, uniformity of the coating on the substrate in the first direction.

In some embodiments, the first extension has a dimension in the first direction of 400mm to 450mm to meet coating requirements.

In some embodiments, the die body comprises: the lower die defines the material cavity, and the feed inlet is formed in the bottom of the material cavity; the upper die is arranged above the lower die; the gasket is arranged between the upper die and the lower die and limits the discharge hole; the pressing strip is arranged on one side, facing the lower die, of the upper die, and is located in the material cavity in the state that the upper die and the lower die are installed in place.

In some embodiments, the upper die is provided with a plurality of first connecting holes arranged at intervals along the first direction, the pressing strip is provided with a plurality of second connecting holes arranged at intervals along the length direction, the positions of the first connecting holes and the second connecting holes correspond to each other one by one, the upper die is connected with the pressing strip through a plurality of fasteners, and the fasteners penetrate through the first connecting holes and the second connecting holes at corresponding positions. The pressing strip can be fixed on the upper die by utilizing the plurality of fasteners, so that the connection reliability of the pressing strip and the upper die is ensured, and the pressing strip is prevented from shaking or falling off from the upper die.

In some embodiments, the second connecting hole is a blind threaded hole and the fastener is a threaded fastener.

In some embodiments, the upper die is provided with a first positioning hole, the pressing strip is provided with a second positioning hole, the upper die and the pressing strip are positioned through a positioning piece, and the positioning piece is respectively in insertion fit with the first positioning hole and the second positioning hole. Through setting up the setting element, can fix a position the layering on last mould, realize the pre-installation of layering on last mould to make things convenient for being connected of follow-up layering and last mould, be favorable to improving production efficiency.

In a second aspect, the present application provides a coating apparatus comprising the coating die of the above embodiments.

Among the technical scheme of this application embodiment, through the coating die head that adopts this application, can make the thick liquids thickness of material intracavity about equally on the first direction to make thick liquids material loading supply stable, guarantee that thick liquids form even stable flow state in the coating die head, and then guarantee the uniformity of coating weight.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram of a coating die according to some embodiments of the present application;

FIG. 2 isbase:Sub>A sectional view of the structure taken along line A-A of FIG. 1;

FIG. 3 is an enlarged partial view of the structure shown in FIG. 2;

FIG. 4 is a cross-sectional view of the structure taken along line B-B of FIG. 1;

FIG. 5 is a schematic view of the assembly of a lower die and a batten strip of a coating die according to some embodiments of the present application;

FIG. 6 is a schematic structural diagram of a lower die of a coating die according to some embodiments of the present application;

FIG. 7 is a schematic structural view of an upper die of a coating die according to some embodiments of the present application;

FIG. 8 is a schematic diagram of a structure of a bead of a coating die according to some embodiments of the present application;

fig. 9 is a sectional view of the structure taken along line C-C in fig. 8.

Reference numerals are as follows:

the coating die head 100 is used for coating,

a die head body 10, a material cavity 101, a buffer cavity 102, a feed inlet 103, a discharge outlet 104,

the lower mold 11, the upper mold 12, the first coupling holes 121, the first positioning holes 122,

the pressing strip 20, the first extending section 201, the second extending section 202, the first side wall 21, the second side wall 22, the third side wall 23, the fourth side wall 24, the bottom wall 25, the second connecting hole 261, the second positioning hole 262,

a first gap 301, a second gap 302, a third gap 303, a fourth gap 304, a bottom gap 305.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments of the present application, like reference numerals denote like parts, and a detailed description of the same parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

Coating is an indispensable step in the battery cell manufacturing process. The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive electrode current collector comprises a positive electrode current collecting part and a positive electrode lug, wherein the positive electrode current collecting part is coated with a positive electrode active substance layer, and the positive electrode lug is not coated with the positive electrode active substance layer.

Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative electrode lug, wherein the negative current collecting part is coated with a negative active material layer, and the negative electrode lug is not coated with the negative active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the spacer may be PP (polypropylene) or PE (polyethylene).

In the production process of the battery monomer, the positive pole piece and the negative pole piece are both manufactured by using a coating process. The coating process is to coat the coating material in the form of liquid or powder on the surface of the object such as fabric, paper, metal foil or plate with a thin layer. Illustratively, a positive electrode active material, a conductive agent, a binder, and a solvent are mixed and made into a paste-like viscous slurry, and then the paste-like viscous slurry is uniformly, continuously, or intermittently coated on a positive electrode current collector substrate (e.g., aluminum foil) to make a positive electrode sheet.

The coating die head used in the coating process is provided with a feeding hole, a discharging hole and a material cavity communicated with the feeding hole and the discharging hole. The external slurry enters the material cavity through the feeding hole under certain pressure, and is extruded and sprayed out along the discharging hole (the discharging gap of the coating die head) under certain pressure and flow rate under the action of the pressing strip to be transferred to the base material, so that the slurry is coated on the base material.

However, the slurry in the material chamber flows to the middle of the material chamber in the length direction under the action of gravity, so that the slurry is agglomerated and settled in the middle of the material chamber, the thickness of the slurry in the middle of the material chamber in the length direction is larger than the thickness of the slurry at two ends of the material chamber in the length direction, and the consistency of the coating weight is difficult to ensure.

In view of this, the embodiment of the present application provides a coating die head capable of improving coating weight, and the specific scheme is that through structural improvement of a pressing strip, a size of a gap between the pressing strip and a wall surface of a material cavity in a middle portion is smaller than sizes of two ends of the gap, so that even when slurry in the two ends of the gap flows to the middle portion of the gap, a thickness of the slurry in the middle portion in a length direction of the material cavity can be ensured to be equal to thicknesses of the slurry at the two ends in the length direction of the material cavity, and thus consistency of the coating weight is ensured.

In addition, it should be noted that the coating die head provided in the embodiments of the present application can be used, but is not limited to, for the production of a pole piece, and can also be used for the production of other workpieces requiring a coating process.

A coating die 100 according to an embodiment of the present application is described below with reference to fig. 1-9.

As shown in fig. 1 to 4, a coating die 100 according to an embodiment of the present application includes a die body 10, the die body 10 defines a material cavity 101, a length direction of the material cavity 101 extends in a first direction, the die body 10 has a material inlet 103 and a material outlet 104, the material inlet 103 and the material outlet 104 are both communicated with the material cavity 101, and the material inlet 103 is located in a middle of the material cavity 101 in the first direction.

Further, the coating die head 100 further comprises a bead 20, the bead 20 is disposed in the material cavity 101, and the bead 20 extends along the length direction of the material cavity 101, that is, the length direction of the bead 20 extends along the first direction.

Wherein, there is the clearance between the wall of layering 20 and material chamber 101, and the thick liquids that gets into material chamber 101 from feed inlet 103 spreads the flow along the first direction under the effect of layering 20 to fill up the clearance, and along with the thick liquids is injected into material chamber 101 from feed inlet 103 gradually, thick liquids can be followed discharge gate 104 extrusion blowout and transferred to the substrate with certain pressure and flow.

Specifically, in the first direction (the left-right direction as shown in fig. 1 and 2, the length direction of the material chamber 101), the size of the middle part of the gap is smaller than the sizes of the two ends of the gap, so that when the slurry flows in the middle part of the length direction of the material chamber 101, the thickness of the slurry in the middle part of the length direction of the material chamber 101 can be compensated, and the thickness of the slurry in the middle part of the length direction of the material chamber 101 can be approximately equal to the thickness of the slurry in the two ends of the length direction of the material chamber 101, thereby ensuring the consistency of the coating weight.

The coating die head 100 of the embodiment of the application, size through the middle part of injecing the clearance is less than the size at the both ends of clearance, when thick liquids in the both ends of clearance flow to the clearance middle part, can compensate the thickness of thick liquids at the middle part of material chamber 101, the thick liquids thickness that makes the length direction's that is located material chamber 101 middle part is roughly equal with the thick liquids thickness that is located material chamber 101's length direction's both ends, even thick liquids thickness in material chamber 101 is roughly equal in the first direction, thereby make thick liquids material loading supply stable, guarantee that thick liquids form even stable flow state in coating die head 100, and then guarantee coating weight's uniformity, can form the thick liquids that have certain width and wait thickness on the substrate.

As shown in FIGS. 2 and 3, in some embodiments, the gap decreases in size in the first direction from both ends of the bead 20 to the middle of the bead 20.

For example, the gap may be divided into two left and right segments of equal length in a first direction (left and right direction as shown in fig. 2), and the size of each segment of the gap gradually decreases from the end of the bead 20 to the middle of the bead 20 along the first direction, so that the size of the entire gap tends to decrease and then increase along the first direction.

For another example, the gap may be divided into three segments in a first direction (e.g., a left-right direction shown in fig. 2), wherein the two segments of the gap located at the left and right ends gradually decrease in size along the segment of the gap located near the middle portion, and the segment of the gap located in the middle portion may keep the same size in the first direction or tend to decrease first and then increase.

Therefore, the size of at least one part of the gap is limited to be gradually reduced from the end part of the batten 20 to the middle part of the batten 20 along the first direction, so that the change trend of the size of the gap in the first direction is gentle, the uniform and stable flowing state of the slurry in the coating die head 100 is further ensured, and the consistency of the coating weight is ensured.

As shown in fig. 2 and 3, in some embodiments, the gaps include a first gap 301, a bottom gap 305, and a second gap 302, and the first gap 301, the bottom gap 305, and the second gap 302 are sequentially arranged and communicated in a first direction, that is, two ends of the bottom gap 305 are respectively communicated with the first gap 301 and the second gap 302.

Specifically, the pressing strip 20 has a bottom wall 25, a first side wall 21 and a second side wall 22, the first side wall 21 and the second side wall 22 are arranged opposite to each other in the first direction, two ends of the bottom wall 25 of the pressing strip 20 in the first direction are respectively connected with the lower end of the first side wall 21 and the lower end of the second side wall 22, a bottom gap 305 is defined between the bottom wall 25 of the pressing strip 20 and the wall surface of the material cavity 101, a first gap 301 is defined between the first side wall 21 and the wall surface of the material cavity 101, a second gap 302 is defined between the second side wall 22 and the wall surface of the material cavity 101, and the sizes of the first gap 301 and the second gap 302 are both greater than the size of the bottom gap 305.

The slurry in the first gap 301 and the second gap 302 can flow to the bottom gap 305 under the action of gravity, so that the thickness of the slurry in the bottom gap 305 can be compensated, the thickness of the slurry in the first gap 301, the thickness of the slurry in the second gap 302 and the thickness of the slurry in the bottom gap 305 are approximately equal, even if the thickness of the slurry in the material cavity 101 is approximately equal in the first direction, the slurry feeding is stable, the uniform and stable flowing state of the slurry in the coating die head 100 is ensured, and the consistency of the coating weight is further ensured.

The first gap 301 and/or the second gap 302 extend downward in the first direction toward the bottom gap 305. For example, the first gap 301 and/or the second gap 302 may form an arc or a diagonal shape extending in the first direction toward the bottom gap 305, so that the size of the first gap 301 and/or the second gap 302 changes more gradually in the first direction, and thus the slurry in the first gap 301 and/or the second gap 302 can flow more gradually toward the bottom gap 305 under the action of gravity, thereby ensuring that the slurry forms a uniform and stable flow state in the coating die 100, and thus ensuring the uniformity of the coating weight.

To further ensure that the thickness of the slurry in the material chamber 101 is substantially equal in the first direction, the size of the first gap 301 and/or the second gap 302 may be gradually reduced in a direction towards the bottom gap 305.

During the coating process, the slurry in the first gap 301 and/or the second gap 302 flows in a second direction (a front-back direction shown in fig. 4 and 5) perpendicular to the first direction relative to the substrate, and can also flow in the first direction relative to the die body 10 under the action of gravity toward the bottom gap 305 located in the middle, and a part of the slurry in the first gap 301 and/or the second gap 302 flows to the bottom gap 305, so that the thickness of the slurry discharged from the discharge port 104 corresponding to the position of the first gap 301 and/or the second gap 302 is reduced, and the thickness of the slurry discharged from the discharge port 104 corresponding to the position of the bottom gap 305 is increased, so that the slurry with a certain width and a uniform thickness can be formed on the substrate.

In some embodiments, the maximum dimension of the first gap 301 and/or the second gap 302 is 1.5mm-2.5mm.

For example, the size of the first gap 301 decreases gradually in a first direction towards the bottom gap 305, and the maximum size of the first gap 301 is 1.5mm, 2mm or 2.5mm, i.e. the size of the end of the first gap 301 far from the bottom gap 305 is 1.5mm, 2mm or 2.5mm.

Similarly, the size of the second gap 302 decreases gradually in the first direction toward the bottom gap 305, and the maximum size of the second gap 302 is 1.5mm, 2mm or 2.5mm, that is, the size of the end of the second gap 302 away from the bottom gap 305 is 1.5mm, 2mm or 2.5mm.

Thus, by limiting the maximum size of the first gap 301 and/or the second gap 302, the thickness of the slurry applied to the substrate can be controlled to meet the application requirements.

In some embodiments, the size of the bottom gap 305 is constant along the first direction, which ensures that the slurry forms a uniform and stable flow state in the coating die 100, thereby ensuring the uniformity of the coating weight, and that the slurry having a certain width and a uniform thickness in the first direction can be formed on the substrate.

In other embodiments, the size of the bottom gap 305 tends to decrease and then increase from the first gap 301 to the second gap 302 along the first direction, and the slurry in the first gap 301 and the second gap 302 may flow toward the bottom gap 305 along the first direction under the action of gravity, so that the thickness of the slurry flowing out from the first gap 301 and the second gap 302 decreases, and the thickness of the slurry flowing out from the bottom gap 305 increases, thereby ensuring the uniformity of the coating weight in the first direction, and forming the slurry with a certain width and a uniform thickness in the first direction on the substrate.

In some embodiments, the minimum dimension of the bottom gap 305 is 1mm-2mm. By limiting the minimum size of the bottom gap 305, the thickness of the slurry applied to the substrate can be controlled to meet the application requirements.

For example, the size of the middle of the bottom gap 305 in the first direction is 1.5mm, the size of the ends of the first gap 301 and the second gap 302 away from the bottom gap 305 in the first direction is 2mm, and the sizes of the first gap 301 and the second gap 302 gradually decrease toward the bottom gap 305 in the first direction.

As shown in fig. 2 and 3, in some embodiments, the first side wall 21 and the second side wall 22 extend downwards gradually in a direction close to each other, so that the structure of the bead 20 is improved, the size of the first gap 301 and/or the second gap 302 decreases gradually in a direction close to the bottom gap 305, and when the slurry in the two ends of the gap flows to the middle of the gap, the thickness of the slurry in the middle of the material cavity 101 can be compensated, so that the thickness of the slurry in the middle of the length direction of the material cavity 101 is approximately equal to the thickness of the slurry in the two ends of the length direction of the material cavity 101, even if the thickness of the slurry in the material cavity 101 is approximately equal in the first direction, thereby stabilizing the slurry supply, ensuring a uniform and stable flow state of the slurry in the coating die 100, and further ensuring the uniformity of the coating weight.

In some embodiments, the surface of the first sidewall 21 and the surface of the second sidewall 22 are both curved to further ensure that the slurry forms a uniform and stable flow state in the coating die 100, thereby ensuring the consistency of the coating weight.

As shown in fig. 4, in some embodiments, the bead 20 has a third sidewall 23 and a fourth sidewall 24, the third sidewall 23 and the fourth sidewall 24 are disposed back to back in a second direction, the second direction being perpendicular to the first direction, and the bottom wall 25 of the bead 20 is located between the third sidewall 23 and the fourth sidewall 24.

It should be noted that the "first direction" and the "second direction" refer to two directions perpendicular to each other, for example, the first direction may refer to a left-right direction shown in fig. 4 and 5, the second direction may refer to a front-back direction shown in fig. 4 and 5, and the first direction and the second direction may be specifically set according to an actual use environment, and are not limited to this, and are not described herein again.

Wherein, the clearance includes third clearance 303 and fourth clearance 304, third clearance 303 is injectd between third lateral wall 23 and the wall of material chamber 101, fourth clearance 304 is injectd between fourth lateral wall 24 and the wall of material chamber 101, bottom clearance 305 communicates third clearance 303 and fourth clearance 304, third clearance 303 is nearer to discharge gate 104 and communicates bottom clearance 305 and discharge gate 104 relative to fourth clearance 304.

Specifically, the slurry entering the material cavity 101 from the feeding hole 103 flows in the first direction toward the first gap 301 and the second gap 302 under the action of the pressing strip 20, and as the slurry increases, the slurry enters the first gap 301, the second gap 302, the third gap 303 and the fourth gap 304, and as the slurry is gradually injected into the material cavity 101 from the feeding hole 103, the slurry can be extruded and ejected along the discharging hole 104 at a certain pressure and flow rate to be transferred onto the base material.

Therefore, by defining the third gap 303 and the fourth gap 304, the time of the slurry in the material cavity 101 can be prolonged, the slurry can flow to each area in the material cavity 101, the slurry feeding is stable, the uniform and stable flowing state of the slurry in the coating die head 100 is ensured, and the consistency of the coating weight is further ensured.

In some embodiments, the third gap 303 gradually decreases in size from bottom to top, and the fourth gap 304 gradually decreases in size from top to bottom. So set up, can guarantee the pressure in material chamber 101, guarantee that thick liquids form even stable flow state in coating die head 100, and then guarantee the uniformity of coating weight, can form the thick liquids that have certain width and wait thickness on the substrate.

In some embodiments, the dimension of the bead 20 in the second direction is 30mm to 50mm, and the dimension of the bead 20 in the up-down direction is 8mm to 16mm, so as to ensure the structural strength of the bead 20, thereby ensuring that the slurry forms a uniform and stable flow state in the coating die 100.

As shown in fig. 2 and 3, in some embodiments, the molding 20 includes a first extension 201 and a second extension 202, the first extension 201 and the second extension 202 are arranged in a first direction, and the first extension 201 and the second extension 202 are respectively formed separately.

The molding strip 20 is divided into at least two extension sections to be molded respectively, so that the molding strip 20 is simple in structure and convenient to mold, and the molding strip 20 is molded separately as an integral slender structure, so that the structural strength of the molding strip 20 can be ensured, and the slurry is ensured to form a uniform and stable flowing state in the coating die head 100.

In some embodiments, the first extension 201 and the second extension 202 may have the same structure, and the first extension 201 and the second extension 202 are disposed axisymmetrically with respect to a symmetry axis, which is perpendicular to the first direction, so as to ensure that the slurry forms a uniform and stable flow state in the coating die 100, and thus the coating on the substrate is uniform in the first direction.

In some embodiments, the first extension 201 has a dimension in the first direction of 400mm to 450mm. The first extension 201 and the second extension 202 may be arranged axisymmetrically with respect to a symmetry axis (here, the symmetry axis extends in a second direction perpendicular to the first direction), i.e. the second extension 202 may also have a dimension in the first direction of 400mm-450mm. That is, the bead 20 has a dimension in the first direction of 800mm to 900mm to meet the coating requirements.

In some embodiments, the bead 20 is a piece of metallic material. For example, the bead 20 is a stainless steel material, which ensures the structural strength of the bead 20, thereby ensuring the reliability of the coating die 100.

As shown in fig. 4, in some embodiments, the die body 10 further has a buffer chamber 102, and the buffer chamber 102 is located between the material chamber 101 and the discharge port 104. With the arrangement, the flowing speed of the slurry in the coating die head 100 can be maintained, and the problems of static areas, sedimentation and the like are avoided, so that the uniformity of the discharging speed of the discharging port 104 is ensured, and the uniformity of the coating on the substrate is further ensured.

As shown in fig. 4 to 6, in some embodiments, the die head body 10 includes a lower die 11, an upper die 12 and a gasket (not shown), the lower die 11 defines a material cavity 101, the material inlet 103 is disposed at the bottom of the material cavity 101, the upper die 12 is disposed above the lower die 11, the gasket is disposed between the upper die 12 and the lower die 11, the gasket defines a material outlet 104, the pressing strip 20 is disposed on a side of the upper die 12 facing the lower die 11, and the pressing strip 20 is located in the material cavity 101 in a state where the upper die 12 and the lower die 11 are installed in place. Wherein the shim can be selected for different coating formats.

As shown in fig. 3, 7-9, in some embodiments, the upper mold 12 is provided with a plurality of first connecting holes 121, the molding 20 is provided with a plurality of second connecting holes 261, the plurality of first connecting holes 121 and the plurality of second connecting holes 261 are in one-to-one correspondence, the upper mold 12 and the molding 20 are connected by a plurality of fasteners (not shown), and the fasteners are inserted through the corresponding first connecting holes 121 and the corresponding second connecting holes 261. The appearances of "a plurality" in this application are intended to mean more than two (including two).

The pressing strip 20 can be fixed on the upper die 12 by a plurality of fasteners, so that the connection reliability of the pressing strip 20 and the upper die 12 is ensured, and the pressing strip 20 is prevented from shaking or falling off from the upper die 12.

The first connecting holes 121 can be arranged at intervals along the first direction, and the second connecting holes 261 can be arranged at intervals along the length direction of the pressing strip 20, so that the pressing strip 20 can be fixed at multiple positions in the length direction of the pressing strip 20, and the connection reliability of the pressing strip 20 and the upper die 12 is further ensured.

In some embodiments, second coupling aperture 261 is a blind threaded aperture and the fastener is a threaded fastener. One end of the threaded fastener penetrating through the first connecting hole 121 can be in threaded fit with the second connecting hole 261, so that the threaded fastener is convenient to assemble and disassemble, and due to the fact that the threaded structure has a certain self-locking characteristic, the threaded fastener can further guarantee the connection reliability of the pressing strip 20 and the upper die 12.

As shown in fig. 3, 7-9, in some embodiments, the upper mold 12 is provided with a first positioning hole 122, the pressing strip 20 is provided with a second positioning hole 262, and the upper mold 12 and the pressing strip 20 are positioned by positioning members (not shown) respectively engaged with the first positioning hole 122 and the second positioning hole 262.

Therefore, the positioning piece is arranged, the pressing strip 20 can be positioned on the upper die 12, and the pre-installation of the pressing strip 20 on the upper die 12 is realized, so that the subsequent connection of the pressing strip 20 and the upper die 12 is facilitated, and the production efficiency is improved.

In some embodiments, the positioning member is a positioning pin. The upper end of the positioning pin may be inserted into the first positioning hole 122 and the lower end of the positioning pin may be inserted into the second positioning hole 262.

It is understood that the first positioning hole 122 and the second positioning hole 262 can be formed as blind holes, and the length of the positioning pin is less than or equal to the sum of the lengths of the first positioning hole 122 and the second positioning hole 262; of course, the first positioning hole 122 may also be formed as a through hole, thereby facilitating insertion of the positioning pin into the first positioning hole 122 and the second positioning hole 262.

The first positioning hole 122 and the second positioning hole 262 may include a plurality of holes, respectively, the upper die 12 and the pressing bar 20 are positioned by a plurality of positioning members, and the positioning members are respectively inserted into and matched with the corresponding first positioning hole 122 and the corresponding second positioning hole 262.

The coating apparatus of the embodiment of the second aspect of the present application is described below.

The coating apparatus (not shown in the drawings) of the present embodiment includes the coating die 100 of the above embodiment.

Because the coating die head 100 of the embodiment of the application has the technical effects, the coating device of the embodiment of the application also has the technical effects, that is, by adopting the coating die head 100 of the application, the thickness of the slurry in the material cavity 101 can be approximately equal in the first direction, so that the slurry is stably supplied, the slurry is ensured to form a uniform and stable flowing state in the coating die head 100, and the consistency of the coating weight is further ensured.

In addition, the coating equipment of the embodiment of the application adopts an extrusion coating mode for coating, and has many advantages compared with other coating modes, such as high coating speed, high precision and uniform wet thickness; the coating system is closed, can prevent pollutants from entering in the coating process, has high slurry utilization rate, can keep the stable slurry property, and can carry out multilayer coating simultaneously. And the method can adapt to different slurry viscosity and solid content ranges, and has stronger adaptability compared with a transfer coating process.

It is understood that other configurations and operations of the coating die 100 and coating apparatus according to embodiments of the present application are known to those of ordinary skill in the art and will not be described in detail herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (20)

1. A coating die, comprising:

the die head comprises a die head body, a first material cavity and a second material cavity, wherein the die head body defines a material cavity extending along a first direction, the die head body is provided with a material inlet and a material outlet communicated with the material cavity, and the material inlet is positioned in the middle of the material cavity in the first direction;

the pressing strip is arranged in the material cavity and extends along the first direction, a gap is formed between the pressing strip and the wall surface of the material cavity, and the size of the middle of the gap is smaller than the size of two ends of the gap in the first direction.

2. The coating die of claim 1, wherein the gap tapers in size from both ends of the bead to a middle portion of the bead in the first direction.

3. The coating die head of claim 1, wherein the gap comprises a first gap, a bottom gap, and a second gap arranged in sequence and in communication in the first direction, and the bead has a bottom wall, a first sidewall, and a second sidewall that are oppositely disposed in the first direction;

the bottom gap is defined between the bottom wall and the wall surface of the material cavity, the first gap is defined between the first side wall and the wall surface of the material cavity, the second gap is defined between the second side wall and the wall surface of the material cavity, and the sizes of the first gap and the second gap are both larger than the size of the bottom gap.

4. The coating die of claim 3, wherein the first gap and/or the second gap extend downward in the first direction toward a direction proximate to the bottom gap.

5. The coating die of claim 3, wherein the size of the first gap and/or the second gap gradually decreases in a direction approaching the bottom gap.

6. The coating die of claim 3, wherein the first gap and/or the second gap has a maximum dimension of 1.5mm to 2.5mm.

7. The coating die of claim 3, wherein the size of the bottom gap remains constant along the first direction; alternatively, the size of the bottom gap tends to decrease and then increase from the first gap to the second gap along the first direction.

8. The coating die of claim 3, wherein the minimum dimension of the bottom gap is 1mm to 2mm.

9. The coating die of claim 3, wherein the first sidewall and the second sidewall extend gradually downward in a direction toward each other.

10. The coating die of claim 9, wherein the surface of the first sidewall and the surface of the second sidewall both form a curved surface.

11. The coating die of claim 3, wherein the bead has a third sidewall and a fourth sidewall disposed back to back in a second direction perpendicular to the first direction, the bottom wall of the bead being located between the third sidewall and the fourth sidewall;

the gap comprises a third gap and a fourth gap, the third gap is defined between the third side wall and the wall surface of the material cavity, the fourth gap is defined between the fourth side wall and the wall surface of the material cavity, the bottom gap is communicated with the third gap and the fourth gap, and the third gap is closer to the discharge hole relative to the fourth gap to be communicated with the bottom gap and the discharge hole.

12. The coating die of claim 11, wherein the third gap gradually decreases in size from bottom to top and the fourth gap gradually decreases in size from top to bottom.

13. The coating die of claim 1, wherein said bead comprises first and second extensions arranged in said first direction, said first and second extensions being individually shaped, respectively.

14. The coating die of claim 13, wherein the first and second extensions are arranged axisymmetrically about an axis of symmetry that is perpendicular to the first direction.

15. The coating die of claim 13, wherein the first extension has a dimension in the first direction of 400mm to 450mm.

16. The coating die of any one of claims 1-15, wherein the die body comprises:

the lower die defines the material cavity, and the feed inlet is formed in the bottom of the material cavity;

the upper die is arranged above the lower die;

the gasket is arranged between the upper die and the lower die and limits the discharge hole;

the pressing strip is arranged on one side, facing the lower die, of the upper die, and is located in the material cavity in the state that the upper die and the lower die are installed in place.

17. The coating die head according to claim 16, wherein the upper die is provided with a plurality of first connecting holes spaced along the first direction, the bead is provided with a plurality of second connecting holes spaced along the length direction thereof, the plurality of first connecting holes and the second connecting holes are in one-to-one correspondence in position, the upper die and the bead are connected by a plurality of fasteners, and the fasteners are inserted through the first connecting holes and the second connecting holes in the corresponding positions.

18. The coating die of claim 17, wherein the second connecting orifice is a blind threaded orifice and the fastener is a threaded fastener.

19. The coating die head of claim 16, wherein the upper die is provided with a first positioning hole, the pressing strip is provided with a second positioning hole, the upper die and the pressing strip are positioned by positioning elements, and the positioning elements are respectively in inserted fit with the first positioning hole and the second positioning hole.

20. A coating apparatus comprising a coating die according to any one of claims 1 to 19.

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